| 摘要 |
PURPOSE:To increase the maintenance and the processing efficiency for the titled method, by producing the mimic digital information by a computer for the digital information which is shared by plural sequence controllers. CONSTITUTION:The change of state is detected for the digital information 11 by a sequence controller 3, and the data is fed to an electronic computer 6 by a data transmitter 4. On the other hand, the computer 6 feeds the data periodically to the controller 3. Then it is diagnosed whether both controller 3 and the computer 6 are carrying out the transmission of data in a normal way or not. When a change of state occurs to the information 1, the computer 6 performs a process to print an alarm message to a typewriter 8. Then the computer 6 decides the normal controller 3 after supplying the common information 2. Thereafter the information 2 is fetched by the normal controller 3 and produces newly the mimic digital information. Based on this digital information 2, the alarm message is sent to the typewriter 8. |
